If you want to beef up the 7AT, talk to Fast Intentions or Level 10. Although, it's probably not as necessary with a supercharger as it would be with a turbo. If I had an auto and was doing your build, I'd set aside the cash for a built transmission and wait until the stock one pops.
Honestly, since you're starting with a base Z, I'd consider brakes and LSD to be more pressing needs than the tranny.
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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent
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